Elementary Practical Chemistry: A Laboratory Manual for Use in Organized Science Schools

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Longmans, Green & Company, 1896 - Chemistry - 288 pages

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Page 149 - The numbers which are at the present time accepted by chemists as the approximate atomic weights of the elements, are given in the third column of the table on the cover. The student should make himself familiar with the atomic weights of a number of the commoner elements. Referring to the table, we there see that the atomic weight of carbon is 1 2 ; let him remember that this simply means, that the smallest weight of carbon which enters into chemical combination is 12 times as heavy as the smallest...
Page 88 - As measured by this scale, the melting point of ice (or the freezing point of water) is 32, and the boiling point of water is 212.
Page 158 - ... combination; and as all other experiments with oxygen concur, the semi-molecule of oxygen is to be received as its atom, and H2 0 is the proper formula for what is both the gaseous molecule and the atom of water. From the densities we may also deduce that 16 is the atomic weight of oxygen, ie that an atom of oxygen is sixteen times as heavy as an atom of hydrogen. Similarly from the densities of ammonia and of its constituents, we learn that the atom of nitrogen is the semi-molecule, and that...
Page 74 - ... taught us the proportions in which these two gases combined together to produce water. If, for instance, the mixture of gases in the bell jar contained equal measures of hydrogen and oxygen, he found that after the explosion there was always some oxygen left over in the vessel E. But if he mixed the gases exactly in the proportion of two measures of hydrogen to one of oxygen, then there was no gas left in E after the explosion ; it entirely disappeared, leaving a vacuum in the vessel. Therefore...
Page 9 - Magnesium, Mg. Manganese, Mn. Mercury, Hg. Nickel, Ni. Nitrogen, N. Oxygen, O. Phosphorus, P. Platinum, Pt. Potassium, K. Silicon, Si. Silver, Ag. Sodium, Na. Sulphur, S. Tin, Sn. Zinc, Zn.
Page 117 - Hydrogen and oxygen, we have seen, unite in the proportion by weight of i part of hydrogen to 8 parts of oxygen. If, therefore, these two gases be mixed together in any other proportion before combination, there will remain over after their union the excess of either the one or the other as the case may be. Thus, if equal weights were present in the mixture before chemical...

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